201661153 has 2 divisors, whose sum is σ = 201661154. Its totient is φ = 201661152.

The previous prime is 201661151. The next prime is 201661177. The reversal of 201661153 is 351166102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187470864 + 14190289 = 13692^2 + 3767^2 .

It is a cyclic number.

It is not a de Polignac number, because 201661153 - 2¹ = 201661151 is a prime.

Together with 201661151, it forms a pair of twin primes.

It is equal to p_11165830 and since 201661153 and 11165830 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (201661151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100830576 + 100830577.

It is an arithmetic number, because the mean of its divisors is an integer number (100830577).

Almost surely, 2^201661153 is an apocalyptic number.

It is an amenable number.

201661153 is a deficient number, since it is larger than the sum of its proper divisors (1).

201661153 is an equidigital number, since it uses as much as digits as its factorization.

201661153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 201661153 is about 14200.7448044108. The cubic root of 201661153 is about 586.4181659252.

The spelling of 201661153 in words is "two hundred one million, six hundred sixty-one thousand, one hundred fifty-three".